How do I handle nested associations in Blueprinter?

Blueprinter allows nested associations by defining separate blueprints and using the association method, as shown in the README with ProjectBlueprint linked to UserBlueprint. You can pass options to customize the nested output, such as setting default values or conditions.

Blueprinter vs ActiveModelSerializers: which is faster?

Blueprinter is generally faster due to its lightweight design and support for optimized JSON generators like Oj. Benchmarks in community discussions often show Blueprinter outperforming ActiveModelSerializers, especially for large datasets, but actual performance depends on specific use cases and configurations.

Can I use Blueprinter with non-ActiveRecord objects?

Yes, Blueprinter works with any Ruby object, not just ActiveRecord models. The README demonstrates this with custom classes and configurable extractors, allowing serialization of plain objects or data from other ORMs like Mongoid.

How to add conditional fields based on user permissions in Blueprinter?

Use the :if or :unless options in field definitions, as explained in the README's conditional fields section. You can pass lambdas that access the object and options, such as user roles, to dynamically include or exclude fields in the JSON output.

What's the best way to format dates in Blueprinter responses?

Blueprinter supports custom datetime formatting via global or field-level settings. You can specify a strftime string or a Proc, as detailed in the README, to control how Date or DateTime objects are serialized, such as converting to timestamps or human-readable strings.

How do I create multiple views for the same model in Blueprinter?

Define views within a blueprint using the view method, like :normal or :extended, and use include_view to reuse fields. This allows different API endpoints to return varying levels of detail, as shown in the README examples with user data.

Open-Awesome

Blueprinter

MITRuby

A simple, fast, and declarative JSON serialization library for Ruby objects, designed as a Rails serializer alternative.

GitHub

1.3k stars115 forks0 contributors

What is Blueprinter?

Blueprinter is a JSON serialization library for Ruby that converts business objects into JSON format. It provides a declarative way to define how data should be presented, using concepts like views and associations, making it a performant alternative to Rails serializers like JBuilder and ActiveModelSerializers.

Target Audience

Ruby developers, particularly those working with Rails applications, who need a fast and maintainable way to serialize models and objects into JSON for APIs.

Value Proposition

Developers choose Blueprinter for its simplicity, speed, and flexibility. It offers a clean, view-based syntax, extensive customization options, and better performance compared to other serialization solutions in the Ruby ecosystem.

Overview

Simple, Fast, and Declarative Serialization Library for Ruby

Use Cases

Best For

Serializing ActiveRecord models to JSON in Rails APIs
Creating multiple JSON representations (views) of the same data model
Building APIs with nested associations and complex object graphs
Replacing JBuilder or ActiveModelSerializers with a faster alternative
Adding conditional fields or dynamic values to JSON responses
Applying custom transformations or formatting to serialized output

Not Ideal For

Projects requiring serialization to formats other than JSON, such as XML or YAML
Applications using GraphQL where data fetching and serialization are managed by the GraphQL layer
Teams needing built-in, automated schema generation or API documentation from serializers
Legacy systems heavily invested in JBuilder or ActiveModelSerializers with complex templates that would be costly to rewrite

Pros & Cons

Pros

Declarative Syntax

Blueprinter uses a clean, class-based structure to define fields and associations, making serialization logic easy to read and maintain, as shown in the README's straightforward blueprint examples.

Flexible View System

Supports multiple JSON representations per model through reusable views, allowing developers to define different output contexts like normal or extended views without duplication.

Performance Optimizations

Designed for speed with configurable JSON generators like Oj or Yajl, offering faster serialization compared to default Rails serializers, as highlighted in the installation section.

Extensive Customization

Provides features like conditional fields, custom extractors, transformers, and dynamic blocks, enabling fine-grained control over JSON output based on business logic.

Cons

JSON-Only Limitation

Blueprinter is tailored exclusively for JSON serialization, lacking native support for other formats like XML, which may require additional libraries or workarounds for multi-format APIs.

Configuration Overhead

Requires manual setup for non-standard cases, such as configuring custom array-like classes or external gems for optimal performance, adding complexity to initial integration.

Limited Built-in Tooling

Unlike some alternatives, it doesn't include features like automatic caching or schema validation out-of-the-box, relying on extensions or custom code for advanced needs.

Open Source Alternative To

Blueprinter is an open-source alternative to the following products:

ActiveModelSerializers

A Ruby gem for serializing Active Model objects into JSON, providing a convention-over-configuration approach to building APIs.

JBuilder

JBuilder was a popular integrated development environment (IDE) for Java development, originally created by Borland and later acquired by Embarcadero.

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